/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.jbpm.workflow.core.node;

import java.util.function.Predicate;

import org.jbpm.workflow.core.Node;
import org.kie.api.definition.process.Connection;
import org.kie.api.runtime.process.ProcessContext;

import static org.jbpm.ruleflow.core.Metadata.UNIQUE_ID;

/**
 * Default implementation of a milestone node.
 */
public class MilestoneNode extends StateBasedNode implements Constrainable {

    private static final long serialVersionUID = 510L;

    /**
     * String representation of the conditionPredicate. Not used at runtime
     */
    private String condition;
    private Predicate<ProcessContext> conditionPredicate;

    public void setCondition(String condition) {
        this.condition = condition;
    }

    public String getCondition() {
        return condition;
    }

    public void setCondition(Predicate<ProcessContext> conditionPredicate) {
        this.conditionPredicate = conditionPredicate;
    }

    public boolean canComplete(ProcessContext context) {
        return conditionPredicate == null || conditionPredicate.test(context);
    }

    @Override
    public void validateAddIncomingConnection(final String type, final Connection connection) {
        super.validateAddIncomingConnection(type, connection);
        if (!Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
            throwValidationException(connection, "only accepts default incoming connection type!");
        }
        if (getFrom() != null && !Boolean.parseBoolean(System.getProperty("jbpm.enable.multi.con"))) {
            throwValidationException(connection, "cannot have more than one incoming connection!");
        }
    }

    @Override
    public void validateAddOutgoingConnection(final String type, final Connection connection) {
        super.validateAddOutgoingConnection(type, connection);
        if (!Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
            throwValidationException(connection, "only accepts default outgoing connection type!");
        }
        if (getTo() != null && !Boolean.parseBoolean(System.getProperty("jbpm.enable.multi.con"))) {
            throwValidationException(connection, "cannot have more than one outgoing connection!");
        }
    }

    private static void throwValidationException(Connection connection, String msg) {
        throw new IllegalArgumentException("This type of node ["
                + connection.getFrom().getMetaData().get(UNIQUE_ID) + ", "
                + connection.getFrom().getName() + "] "
                + msg);
    }

}
